+
+ public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
+ {
+ return self::getScalingValues($this->width, $this->height,
+ $maxWidth, $maxHeight, $crop, $this->rotate);
+ }
+
+ /*
+ * Gets scaling values for images of various types. Cropping can be enabled.
+ *
+ * Values will scale _up_ to fit max values if cropping is enabled!
+ * With cropping disabled, the max value of each axis will be respected.
+ *
+ * @param $width int Original width
+ * @param $height int Original height
+ * @param $maxW int Resulting max width
+ * @param $maxH int Resulting max height
+ * @param $crop int Crop to the size (not preserving aspect ratio)
+ */
+ public static function getScalingValues($width, $height,
+ $maxW=null, $maxH=null,
+ $crop=null, $rotate=0)
+ {
+ $maxW = $maxW ?: common_config('thumbnail', 'width');
+ $maxH = $maxH ?: common_config('thumbnail', 'height');
+
+ if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
+ throw new ServerException('Bad parameters for ImageFile::getScalingValues');
+ } elseif ($maxH === null) {
+ // if maxH is null, we set maxH to equal maxW and enable crop
+ $maxH = $maxW;
+ $crop = true;
+ }
+
+ // Because GD doesn't understand EXIF orientation etc.
+ if (abs($rotate) == 90) {
+ $tmp = $width;
+ $width = $height;
+ $height = $tmp;
+ }
+
+ // Cropping data (for original image size). Default values, 0 and null,
+ // imply no cropping and with preserved aspect ratio (per axis).
+ $cx = 0; // crop x
+ $cy = 0; // crop y
+ $cw = null; // crop area width
+ $ch = null; // crop area height
+
+ if ($crop) {
+ $s_ar = $width / $height;
+ $t_ar = $maxW / $maxH;
+
+ $rw = $maxW;
+ $rh = $maxH;
+
+ // Source aspect ratio differs from target, recalculate crop points!
+ if ($s_ar > $t_ar) {
+ $cx = floor($width / 2 - $height * $t_ar / 2);
+ $cw = ceil($height * $t_ar);
+ } elseif ($s_ar < $t_ar) {
+ $cy = floor($height / 2 - $width / $t_ar / 2);
+ $ch = ceil($width / $t_ar);
+ }
+ } else {
+ $rw = $maxW;
+ $rh = ceil($height * $rw / $width);
+
+ // Scaling caused too large height, decrease to max accepted value
+ if ($rh > $maxH) {
+ $rh = $maxH;
+ $rw = ceil($width * $rh / $height);
+ }
+ }
+ return array(intval($rw), intval($rh),
+ intval($cx), intval($cy),
+ is_null($cw) ? $width : intval($cw),
+ is_null($ch) ? $height : intval($ch));
+ }
+}
+
+//PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
+if(!function_exists('imagecreatefrombmp')){
+ //taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
+ function imagecreatefrombmp($p_sFile)
+ {
+ // Load the image into a string
+ $file = fopen($p_sFile,"rb");
+ $read = fread($file,10);
+ while(!feof($file)&&($read<>""))
+ $read .= fread($file,1024);
+
+ $temp = unpack("H*",$read);
+ $hex = $temp[1];
+ $header = substr($hex,0,108);
+
+ // Process the header
+ // Structure: http://www.fastgraph.com/help/bmp_header_format.html
+ if (substr($header,0,4)=="424d")
+ {
+ // Cut it in parts of 2 bytes
+ $header_parts = str_split($header,2);
+
+ // Get the width 4 bytes
+ $width = hexdec($header_parts[19].$header_parts[18]);
+
+ // Get the height 4 bytes
+ $height = hexdec($header_parts[23].$header_parts[22]);
+
+ // Unset the header params
+ unset($header_parts);
+ }
+
+ // Define starting X and Y
+ $x = 0;
+ $y = 1;
+
+ // Create newimage
+ $image = imagecreatetruecolor($width,$height);
+
+ // Grab the body from the image
+ $body = substr($hex,108);
+
+ // Calculate if padding at the end-line is needed
+ // Divided by two to keep overview.
+ // 1 byte = 2 HEX-chars
+ $body_size = (strlen($body)/2);
+ $header_size = ($width*$height);
+
+ // Use end-line padding? Only when needed
+ $usePadding = ($body_size>($header_size*3)+4);
+
+ // Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
+ // Calculate the next DWORD-position in the body
+ for ($i=0;$i<$body_size;$i+=3)
+ {
+ // Calculate line-ending and padding
+ if ($x>=$width)
+ {
+ // If padding needed, ignore image-padding
+ // Shift i to the ending of the current 32-bit-block
+ if ($usePadding)
+ $i += $width%4;
+
+ // Reset horizontal position
+ $x = 0;
+
+ // Raise the height-position (bottom-up)
+ $y++;
+
+ // Reached the image-height? Break the for-loop
+ if ($y>$height)
+ break;
+ }
+
+ // Calculation of the RGB-pixel (defined as BGR in image-data)
+ // Define $i_pos as absolute position in the body
+ $i_pos = $i*2;
+ $r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
+ $g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
+ $b = hexdec($body[$i_pos].$body[$i_pos+1]);
+
+ // Calculate and draw the pixel
+ $color = imagecolorallocate($image,$r,$g,$b);
+ imagesetpixel($image,$x,$height-$y,$color);
+
+ // Raise the horizontal position
+ $x++;
+ }
+
+ // Unset the body / free the memory
+ unset($body);
+
+ // Return image-object
+ return $image;
+ }
+} // if(!function_exists('imagecreatefrombmp'))